单项选择题

China started its space industry only in recent years, and should ______ no time in catching up.

A. delay
B. lag
C. lessen
D. lose
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单项选择题
It seems oil ______ from this pipe for some time. We'll have to take the machine apart to put it right.
A. had leaked
B. is leaking
C. leaked
D. has been leaking
单项选择题
______ the water left in the kettle, the doctor put several things he unwrapped from a handkerchief.
A. At
B. To
C. Within
D. Into
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